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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b5cea1117271c6067a2634dd77fc4c9e3cb5d7432edcceab20df2651c0566e' 
  AND token = 'GkIc6ItW+ZaW607wS3AFQgPz/w64bzUpPRmlLenXWog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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