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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0732d9ea7019c125ebc50042efccac2de829f0b26129440ef5efc2525120971' 
  AND token = 'TchjUA0hIUlleEwJ3/ZPEp63zCLAU7y8zYocqpdsd4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}