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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d98b597076da2bc4a4474a3d9b77128b2bc81f890cdce74a1f00edd16f87a4' 
  AND token = 'V+ars1PiZHrqgSC26CrgPciGxKsG0hpDS+pGAFXC0nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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