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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509fc50baedd6439f041c80c5d814bf5cfa70d0b4d8e3b541f3aea8ed0ffc3a9' 
  AND token = 'jJasbkd79qzpHBHGHTipcUiDGfBkCOMGv2eC7bNVFkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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