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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b327ae59ede2c1d98b4ea6d6835eebd914e62b07328b67a38665252cb1f96d79' 
  AND token = 'PLrYu/vrqL/qQ3mQq1Xm9InMsKsX6XUrPMLkpyzbNdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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