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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77c31c902bdbc623131570b694e876b74d24827613b1178b8644617a771488a' 
  AND token = 'BCO7sKzsR5C5dgcMbtt6LXfRJ1NVR278NtDkPFXs+y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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