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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3f233f6fb5120366e30a0e0559c62eff7766e28cdee3fab44782642c8de1c2' 
  AND token = 'b+wROWvlTPw/bhNOkFBJ910t1+6dp/X91RXbglKWqo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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