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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4d834bfde7d0ae9d87ec41b9a2290a2eee111b6cae527b0ac07f09ab94d116' 
  AND token = 'yIXfek48TRNoc/sAr41f1UExZ9j/DvQujSqsbj4HYH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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