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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676352aefb9a7398f2198d0f91e4eea2a29db6681ca45b0665529e2014756221' 
  AND token = 'yddDzVyO1fD3d6WlSiL9oqE6MWp/Z1iV5M0F4mMAux8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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