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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0b0d934fd62aff5adca6811b3fc575860a705e3b82d981bf9df1bb74c59dfc' 
  AND token = 'br/maI/Q5WyJB0nKiRr9m/KIxwbxdQgZ0lBoh4G9EM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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