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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48388a77d0566b5ff656104b2ca6c9f834ced030d118fcc231b85256460a04d0' 
  AND token = 'vlquGtgcIdlcElK4pUflTJ2efxxAoz3cboNgk18ENH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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