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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11f69d12211b06c7b0e70cec39a6033e9ac8c9e5a4b26565dcbe3a73dfb73e0' 
  AND token = 'tTvJvgXD7/2idPCINYv+EIdx2C2fos/J/9uV8m4mRSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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