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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18351f9f336d1edb4f4a2e2887e112f9a23ea0be72a2999fa304e33ad1b6328d' 
  AND token = 'YQRg/iAD/oLHpbQ5nsem3P91eSDWCGgvBKLFX2UhkE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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