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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f810d488700f877c689023370c9aab4465b3fce688e8d09c2ca283b0e9535b17' 
  AND token = 'X1jrIM97O0+59wIAdjHan/k/isytZGwqJ4cp6CK1hn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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