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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8a8902529705856f0332d146974e4784a2f4e3586c14e0f11c845ab8f2293d' 
  AND token = 'bdjXFO/Q0bT/c2RVP3XXRe59OgH8BsRfJ36hJu+OTj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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