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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95ee426b3f0489e64900e7e613cd9e07749fa5e3e67b903443e766f583efd53' 
  AND token = '9Nn0RFetrI/iog7ZoiEgXBoj6z3i6j3rQ3B/6iDm7AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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