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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbddad824501500c02e04989f67773540bec84939f2d33fb048256b13ea5ce6' 
  AND token = 'le4Y0lDxCgaQNt3O6dBE2h8duUp3juW2EkV1iM1kd+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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