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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a412d8483d212c7e3a5b00f720aa8f1ca62f872503a4be66e2dd93bf667a795' 
  AND token = 'nCidc4V20sBZB+1q0irkTWjr592KLuq0kGrCbGVAUzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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