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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155d974ec172174f439e25d5a534b0434539e06f5a3cef0c3247d99986810cf2' 
  AND token = 'jgf26HYS6BPUsQ3nae/jsdfB4myRlMYAsL3WBF0zeAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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