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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95663b1cbe6495e456a7380f6e12cc0c44ebc3ea62365ac1b02e42fb7bf246de' 
  AND token = 'H7D5VoqTq/2/e/ySYWugFqQWkDpNhuQLQ8Ub3erq1d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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