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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5475c9bd355af7865c71f9bf966d9709db1cb2e3e4bb3af0455e605df551f64' 
  AND token = '7n/LsF62x1s0ae1a56VGZCWvjmHSChdX8oUYelM4vzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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