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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472dc76a364078da0d09c8d014f34899e882d5a522412bbac0b584a3e15bc631' 
  AND token = 'FROKRh/SVcz5L1zgz6xlDU+Y5HaQmFacuRY0Qe9As7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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