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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb179a37cea2dcb2e31194795f33f4119b034d7edcf7a52177df56f8095ad4aa' 
  AND token = 'kyVkucz+VQ2a5ZZEAB/lx8OB3JRJrhOWpbmpf2ATlRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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