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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecd5775002929b6a6bdd8b114c86ea085edb34999513a5ffaa9be84b2d7b18f' 
  AND token = 'JkxVyQivZ62UAOcRftJ9BPpKS0c7gIORGqDWQUFUS18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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