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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf09e6a17c256502da695197d80f4f7ecf424fc6252b961aead2cd30cee2a4d2' 
  AND token = 'FO59WGNVYgyobi9dxRig4Q5W5SADD/MmnEuY7D3zVVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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