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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fe69253b9e0fe1496fc6d531b9395a61a687eb3edfca624b17f6985da8a7ad' 
  AND token = 'eI4I075w2Msiz04uCovlUaDn1otwMfEMYHnJlo+3gLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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