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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7bf458e030d09ce9b0698f7fded5345a4cd1a5b92b3161f4e0b7419bd7981b' 
  AND token = '3IZkt7BAvjExMwp+jx92utGR8MS7/IdzconQhmMtSdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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