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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c894377e2066767fcc3428003bca6dc42f66cf0fc70d5daedfdfcbc576dd2667' 
  AND token = 'cjuU5VmRYMlk8YkqvEuOAT2Hq9hlgE0J73rdL5+b3dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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