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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e64c8a8da42e0f5be2da35f847f71db87b80aabf6b8e9a17386cc7f3f68e4e' 
  AND token = 'Qe4p/M5YwrzYcAOpr/GZrScowYfa98ins/oFIQisv+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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