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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3feaad0f3689557c4120d82662fdc40fc0b119024b2fd684bc47b22877bbc7' 
  AND token = 'dCdM/MOLXU79EJKCkWYw8aPj52dGDGd0TO+viEVtvxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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