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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9be6839a3163b2dba97808ee01b4a2f3067989d9474514932c97e4c1584a2cb' 
  AND token = 'my+CvoyFpr3OvilKdffDQM7gh5hMrymgSnRHQbh7COE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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