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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d54c863b86143478947d35b47771907f5060992ed82a8b020a2f34bbac9dbe6' 
  AND token = 'r4yRodM3O1OebuPEuEHBiMUUNh7l0xLG6AUuGnOK7PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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