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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3b9d1d4dfd859f96e8d2a51cf56691979733ef09e11325446f4077c2796f76' 
  AND token = 'Fj3m3HkhUbYE2rpS6NE+gUy8BHEoD2PwbacdzLFYMi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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