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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a955d56c780cc7b787d54f5e91ddcf79d24518e20f5660c8909274c7953bd8' 
  AND token = '6mtDvePruRefAQbz7dIQgup2sV3vPO2xe1GG9Pe/yO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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