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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae32c46267275227039d5923bf4109ad955d22f60d23972213ea1e6c3f2b94e' 
  AND token = 'wGP9T9vEeVG15EvTkYHWy0PuTk/lrhtCUx2N1h2Z4O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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