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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc235fc3a10f95c85cdb3caba9ae419be3344203e13340bb7448acfac7bc397' 
  AND token = 'FI5anKl3FpiYqfg8Fl3QypQGdMrzAwJyGH2swD63hnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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