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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87afd76ac19b55a0e2f02b08a6216d2a2b884f14d38667178494828d4bef3d9a' 
  AND token = '8ZzXW7JfsN27CZuX8S4lN1giF+5mgmQx7ZUWlx3nbDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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