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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be80fdd0ac0d877858cd8a21a0efec7f11e3ffb0c7deadda5022cd2e097f70ff' 
  AND token = '/ckinI700RNnRceHfzo7XWOOYHlw7jEndxF4jx6qS3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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