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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662ca2ddae35557f82b48b70e451dc29be77f5a022d25501fcf582c386806dea' 
  AND token = 'ikyB4xYMl9HCuevtV4AgkOHsn4dFkFRB4wn1+cOgo/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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