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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecafa1e2d41e9ea679db75e95e81c2bf8b1bea6200a1559528da9ad2714a5ad' 
  AND token = 'YrRj7s4U0WycKw7O/KFwNro9RuRLysvRD4WFp7AaKQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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