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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146367d5765fdada808cb894b95d0041bc57378d421467c3eb89f436d195bab2' 
  AND token = '7L7gAsjZQniS5muia+hWck3bNa9cDTFNd9KMs+BoIdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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