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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9008f43c3e3fa1afd87d8f683ff8f8715bcbb53137c376d6cf31cbbc9a148b64' 
  AND token = '3Keo95XVCzQYRs+GJHoivhSyD5vhx6vy/erf3VmdLro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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