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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf22e889e2e4a3821a9345c0cd1784c5cef40dae5e905c34768bd943c23a125' 
  AND token = 'En1BsAVoERBcNwWJJzT71IO76WAM/1XzMXD5Horjj4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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