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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9c5172d6852b44b3b006385a119f3d3f4c6b4432954ccc05a008b8ce893580' 
  AND token = 'mnHmcnZFRcku7Hlv92N5isYxaA2qvTzxYJrA0dFcCYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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