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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76dacd9b5a69c24ee56b033685c2b108a2c3829bc766ff9f7535cfcc915f1645' 
  AND token = 'DKehxMd5KGTMwGoAaR3CqJ/6ySwFRD3bLetAiQRCSeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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