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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52a8eb6d81b3a724b3192e09d675b67306da5f441995094509cbaa9c4d1bb5f' 
  AND token = '/G2cCWQUJe0S45OT2Xag3TtfjkAZExGT7MJ57dEdNq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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