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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ba6ae36b8821c91fff0de09bbf23b795d782172a0480c003fd41f722d6b5e1' 
  AND token = 'K6aPQM/M07cK37wXNc7tA7hww8l2tcCvKNOjD9QO4T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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