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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1c26bf8e5efd3547647ad018d777ecc85e57cadfc1e436b01ee84fee8dd890' 
  AND token = 'GDL2VFw5D5d1MR+kwx77s2GDoedouFby5ZIJ3xJarMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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