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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68253170facf964dd4f89d5c7364de92a3841ee858c69c6fde97508ab35a92f' 
  AND token = 'w3Mt6BxPxAJtC2vDZTLrN4oULh0cVPy5i5ujyvYOrdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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