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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebabd8fecca2e190f80f96602dab4c1697259d43a9fb7bc9f92e8dae6d29b872' 
  AND token = 'udlO/pZdT/a0k0fwlezcQwfCET2228v6bdvOrqaKz98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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