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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abef4933be30d35bd7c46a58a19538d6c34bee19056f886bd77991ed98799b5' 
  AND token = 'I9+ojRmq0R9Kcc95i3QTOr9yYOpvxxMz3mQ3NTXl9bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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