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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c3161cf8efa7a1e89c9c3a9d48339cb7b5cd4d5107cc02df3e98e45c0776c5' 
  AND token = 'VwhZTHNpD3Dmk8Wek8GXv424uKJD++gkeuvgMxSSm6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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