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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae9fff23784163720b08331a1354f0628aa366e13a0be748bba4581c5551e74' 
  AND token = 'WP6eVTmY/LiRIGxcabKff05ZO6TmCB1alg8eB4lSPvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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