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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a337ae4a1ec3ea654f4a77b1aad930ef784f599425e945b39f9a993dadac99f0' 
  AND token = '8DXNJMBDU8mOj6rCpEg+D/eGd49gnwkFDeezn5mshcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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