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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53ad556f6b7d4a4768cdb6c457795f8b73a5ec5e032e9fef2aee511c4c311f0' 
  AND token = '/F2mhQgEks3QVrUOXEi1OW0Z/jJuri3r5f8ZfDFn090=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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