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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3fdf8115a7c85de757761808338c273bc9c984acf7e427b7b0d8922bf5ebff9' 
  AND token = 'jmcRRFhBext5RZXmdnedBaG5n0zGqbmw/jwkSmvLw7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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