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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39856794634246ded34b1a55a5a3c2daff1c58f515e9d9fca47bc03d320f5cf' 
  AND token = '1+O+PiVHYwC/eK0fy3fWlZ61KltKwPDR2GaARPlG7qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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